When answering a question like the OP ask I use caution. He did not post the type of action or bore condition and dimension or chamber condition etc. His level of knowledge may indicate he should use a tested load.
I will be starting out low and slow. I most definitely respect the laws of physics and I tend to rush into things of this nature like molasses. I just wanted to be sure I have some options down the road if I buy a powder or bullet type that is available now, since most of the more common ones currently are not.